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Homeowner Financing Options for Garden Suites in Ontario

Updated 2025 • ADU / Garden Suite Financing Guide

Adding a garden suite (Accessory Dwelling Unit) increases property value, creates rental income, and adds flexible living space. The biggest question homeowners have is simple — How do I pay for it?


1. Home Equity Line of Credit (HELOC)

How it works: Borrow against your home's equity and pay interest only on the amount used.

✔ Lower interest rates
✔ Flexible during construction
✔ Ideal for phased builds

2. Mortgage Refinance

Replace your existing mortgage with a larger one and receive cash.

  • Single monthly payment
  • Lower long-term rates
  • Up to 90% post-construction value
3. Canada Secondary Suite Loan

Federal program supporting secondary suites.

Up to $80,000 loan • ~2% interest • 15 year term

4. Construction / Renovation Loan

Funds released in stages — foundation, framing, finishing.

  • Better cash flow
  • Good for custom builds
  • Converts to mortgage

Quick Comparison

Option Best For Pros Cons
HELOC Flexible access Low rates Variable interest
Refinance Lump sum Single payment Resets mortgage
Federal Loan Low cost 2% interest $80K limit
Construction Loan New builds Stage funding Paperwork
Private Lender Fast approval Flexible Higher rates
Final Thought: Most homeowners use a combination of HELOC + refinance + grants. A garden suite is usually cash-flow positive once rented.
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